Tunable Selective Hydrogenation of Cinnamaldehyde by Capped Pt/Pd Nanoparticles Supported on Carbon Nanotubes

Abstract

A series of catalysts containing Pt or Pd nanoparticles (NPs) jointly regulated by cytidine (Cs) and polyvinylpyrrolidone (PVP) have been prepared for selective hydrogenation of cinnamaldehyde (CAL). The Pt/Pd NPs were supported on carbon nanotubes (CNTs) with different structures for promoting catalytic activity and tuning product selectivity. The synergistic effect of Cs and PVP on Pt/Pd surface promotes hydrogenation activity. The synergy between Pd NPs and multi‐walled CNTs with the diameter of <8 nm greatly promoted the hydrogenation of C=C bond in CAL. The synergy between Pt NPs and single‐walled CNTs with the diameter of <2 nm effectively enhanced the hydrogenation of C=O bond in CAL. These synergistic effects are attributed to the suitable size and exposed (111) facets of metal NPs, the transfer of electrons and the interaction between metal and support.

One-Pot Synthesis of Ultra-Small Pt Nanoparticles-Loaded Nitrogen-Doped Mesoporous Carbon Nanotube for Efficient Catalytic Reaction

“…This usually requires the addition of reducing agents like sodium borohydride and ethylene glycol [21,22]. And, for smaller and highly dispersed metal nanoparticles, it is often necessary to add certain stabilizers, such as citric acid and polyvinylpyrrolidone [23,24]. In recent years, a more convenient, "one-pot" co-deposition method has been developed for the in situ deposition of metal nanoparticles on the functionalized surface with amino groups, polydopamine (PDA), and others, avoiding the use of stabilizers [25][26][27][28].…”